5-氟-1-甲基-1H-吲哚-2,3-二酮 在
C
31H
26F
6N
4O
2 、 magnesium sulfate 作用下,
以
四氢呋喃 、
二氯甲烷 为溶剂,
反应 4.5h,
生成 ethyl 5-fluoro-4'-hydroxy-1-methyl-2-oxo-4',5'-dihydro-2'H-spiro[indoline-3,3'-thiophene]-2'-carboxylate 、 (2'R,3S,4'S)-ethyl 5-fluoro-4'-hydroxy-1-methyl-2-oxo-4',5'-dihydro-2'H-spiro[indoline-3,3'-thiophene]-2'-carboxylate 、
(2'S,3R,4'R)-ethyl 5-fluoro-4'-hydroxy-1-methyl-2-oxo-4',5'-dihydro-2'H-spiro[indoline-3,3'-thiophene]-2'-carboxylate